eNodeB: RRC inactivity timer (not implemented)

RRC inactivity timer is a not implemneted feature of OAI enodeB.

When a UE sits in IDLE for a certain amount of time (usually 10 seconds), the eNodeB should trigger a UEContextReleaseRequest towards the EPC with cause #20 (closed) (user inactivity), and after receiving the UEContextReleaseCommand, the eNodeB should properly release the RRC connection to the UE.

Please note that this feature strongly depends on other missing features like the S1 release procedure in the EPC.

Implementation guideline:

• Acceptable range of RRC inactivity timer: 0-60 (sec.)
• Default value: 10 sec.
• Value 0 means this feature is turned off (the eNodeB does not triggers the UEContextRelease).
• The parameter should be changeable in enodeb.conf

Related issues:

• S1 release handling is not implemented in OAI EPC
• Service request handling is not implemented in OAI EPC